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"Before trying the treatments under the arms..."

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Yellow underarm stains on a white shirt are never a welcome sight – and here`s the kicker – those same stains are also lurking on colored shirts as well, just not as visible. First, a quick primer on what causes those stains, how to prevent them and how to remove the yellow stain:
Underarm stains are caused by the reaction between anti-perspirant ingredients and the salts in your sweat. Most anti-perspirants contain aluminum compounds to reduce wetness. It is the aluminum that causes the build-up and yellowing on fabrics. The stains don`t appear overnight, but without proper handling of garments may happen after continuous wear.
Wear an undershirt to help protect your more expensive outer shirt. However, if an extra layer is just not possible, try switching to an aluminum-free deodorant. Read the labels and you`ll find that anti-perspirants have varying levels of aluminum compounds. Choose a brand with the lowest aluminum content that provides the protection you need.
After applying deodorant, allow it to dry before dressing to prevent rub-off on fabrics. If you don`t have time to wait, a couple of blasts of air from a hair dryer will do the trick.
If you have perspired while wearing a garment, wash or dry clean it as quickly as possible. Stains are much harder to remove once they become set in. If you notice the beginnings of yellow stains, stop using the dryer. The heat can set in residual stains making them almost impossible to remove. Dry shirts in the sun to increase whitening of fabrics and if that`s not possible, air dry indoors.
How do I get the rid of the yellow?
First, be certain that your shirt is washable. If it says dry clean only, believe the tag. Dry clean after each wearing to prevent yellowing. If your shirt is white and washable, here are two methods to try. Success will depend upon how old the stains are and the fabric content of your shirt – cotton whitens best.
𠈡:1:1 – One part baking soda, one part peroxide, one part water. Make a solution of the three ingredients. You will need about 1/4 cup each of baking soda, peroxide and water to treat one shirt. Protect the countertop with a thick white towel, rub 1:1:1 solution into stains and allow to work for at least 30 minutes. Use an old soft toothbrush or bristle brush to loosen any residue and then wash as usual in warm or cold water.
𠈡:1 – One part oxygen-based detergent (OxiClean), one part ammonia. In a well-ventilated room, wearing rubber gloves, mix solution well – about 2 tablespoons of each ingredient per shirt. Again, protecting countertop with thick white towel, rub solution into stains for at least 30 seconds. Wash as usual in warm or cold water.
For light colored shirts (blue, yellow, pink) test the solutions in an inconspicuous spot – perhaps along a hem – before trying the treatments under the arms. If there is no fading, proceed as for white shirts.
Darker colors may have stiffness or residue on the fabric under the arms. To remove the build-up and freshen the garments, fill the washing machine with cool water and add one cup of white vinegar. Allow shirts to soak for at least 30 minutes. Drain vinegar water and wash as usual in cool water.

"You used deodrant or perfume under your arms then they will be turn yellow..."

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Your shirt may turn yellow by various steps which are as follow.
1). white fabrics or excessive cologne that are not colorless and therefore making your clothes turn turns yellow
2). and if you used deodrant or perfume under your arms then they will be turn yellow. However there are a couple of ways you can actually be able to maintain this problem that is if your white shirts have turned yellow , some baking soda may be used for washing white clothes and does actually prevent it from fading.
I hope this answer will helps you a lot.

"You used deodrant or perfume under your arms then they will be turn yellow..."

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Your shirt turn yellow caused by various reasons 1.) white fabrics or excessive cologne that are not colorless and therefore making your clothes turn turns yellow 2.) and if you used deodrant or perfume under your arms then they will be turn yellow. However there are a couple of ways you can actually be able to maintain this problem that is if your white shirts have turned yellow , some baking soda may be used for washing white clothes and does actually prevent it from fading.

If you actually get yellow stains on your white washing this may be through various reasons example use of excessive bleach used or washing your white clothes by mixing them with a variety of other clothes that actually do decolorize when in the washing machine, you need to make sure you take the brightly colored clothes and separate them with your white clothes when doing laundry. Another thing may be that the washing machine is or has not been washed properly therefore the specs dirt when they come into contact with water and detergents they stain the clothes.

Getting yellow stains on your white washing may be due to excessive bleach used.or if you want to wash you white clothes in the washing machine make sure you take the least time cause excessive washing will lead to it to turn to yellow. Washing in the washer also determines because you are not supposed to wash in it with warm water but always use cold water.

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